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Corrosion Behavior of Low-Carbon Steels in Grande Ronde Basalt Groundwater in the Presence of Basalt-Bentonite Packing

Published online by Cambridge University Press:  25 February 2011

R.P. Anantatmula ,
C.H. Delegard  and
R.L. Fish
R.P. Anantatmula
Affiliation:
Rockwell Hanford Operations, P. O. Box 800, Richland, Washington 99352
C.H. Delegard
Affiliation:
Rockwell Hanford Operations, P. O. Box 800, Richland, Washington 99352
R.L. Fish
Affiliation:
Rockwell Hanford Operations, P. O. Box 800, Richland, Washington 99352
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Abstract

Three low-carbon steels (AISI 1006, AISI 1020, and AISI 1025) were tested at 150° and 250°C in Hanford Grande Ronde Basalt groundwater (9.75 pH) under anoxic conditions (≤0.1 mg/L oxygen in water) in packing (75 wt% basalt + 25 wt% bentonite) for 1 and 2 weeks. Testing was initially performed in air-equilibrated groundwater (oxic conditions) without packing at 150°C. The average corrosion under anoxic conditions with packing was at least a factor of seven lower than that for oxic conditions at 150°C. The data indicated that carbon composition apparently affects the corrosion of low-carbon steel under oxic conditions. Under anoxic conditions with packing, corrosion was independent of the carbon composition of the steel as evidenced by almost equal weight losses for all three steels at 150° and 250°C. The weight loss at 250°C was about the same as that at 150°C due to the formation of a very adherent layer of iron-rich clay on the surface of the steel at 250°C, reducing the rate at which corrosion proceeds. Pitting was not detected in any of the specimens. Assuming linear corrosion kinetics, extrapolation of the 2-week data to 1,000 yr resulted in approximately 12 mm penetration of the low-carbon steel in Grande Ronde Basalt groundwater under anoxic conditions with packing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 113
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

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